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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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As leveling involves measuring vertical distances relative to a horizontal line of sight, it requires a graduated rod, called a level rod, for vertical measurements and an instrument called a level for a horizontal sight line. A level includes a high-powered telescope with a mechanism for leveling to ensure the line of sight is horizontal when the bubble in the spirit level is centered. Leveling rods, made of wood, metal, or fiberglass, are graduated in feet or meters and commonly used in two-...
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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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A Review: Absolute Linear Encoder Measurement Technology.

Maqiang Zhao1, Yuyu Yuan1, Linbin Luo1

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Summary
This summary is machine-generated.

This review details absolute linear encoder technologies for precision measurement and manufacturing. It covers fundamental principles, coding evolution, and error sources, guiding practitioners and future development.

Keywords:
absolute linear encodercoding technologydisplacement measurementerror analysis

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Area of Science:

  • Metrology and Measurement Science
  • Precision Engineering
  • Manufacturing Technology

Background:

  • Absolute linear encoders are crucial for high-end manufacturing and precision displacement measurement.
  • Key advantages include eliminating homing and retaining position data during power loss.
  • A lack of comprehensive review materials hinders practitioners in this field.

Purpose of the Study:

  • To provide a systematic review and practical reference for absolute linear encoder measurement technology.
  • To address the scarcity of systematic guidance for professionals.
  • To clarify technical pathways and challenges in the field.

Main Methods:

  • Systematic delineation of three fundamental measurement principles.
  • Analysis of the evolutionary trajectory of quasi-absolute and absolute coding technologies.
  • Summarization of primary error sources affecting measurement accuracy.

Main Results:

  • Categorization of measurement principles and coding technologies (quasi-absolute and absolute).
  • Identification and explanation of error sources impacting encoder accuracy.
  • Clarification of key technical pathways and current challenges.

Conclusions:

  • The study offers a decision-making guide for technology selection and insights into future development.
  • Future focus should be on fault-tolerant coding, integrated manufacturing, and error compensation.
  • Advancement aims for higher precision, miniaturization, cost reduction, and reliability in encoders.